Apparatus for making electric-lamp bases.



J. E. ORIGGAL.

APPARATUS FOR MAKING ELECTRIC LAMP BASES.

APPLICATION FIL ED APR.11, 1911.

Patented Dec. 12, 1911 2 SHEETS-SHEET 1.

l I l wnu'essssz J. B. GRIGGAL.

APPARATUS ron MAKING ELECTRIC LAMP BASES.

APPLICATION IIIQED APR. 11, 1911. V

Patented Dec. 12, 1911.

2 SHEETSSHEBT 2.

mvsuroa f llllll ll illlll'lllll AY M WITNESSES:

JOHN-EDWARD OBIGGAL, OI' WOL 1 1 i DING] GAS BUB-HEB OE rnovmnncrtfmionn r011 1141mm mncrmc-Lm Specification of Letters Patent.

Application am April 11, 1911. Serial Io.=880,401.

iPatented Dec. 1 2, 1911.

To aZl-whom'it may Be it known .thatI, JOHN EDWARD CRIGGAL, subject ,of the King ofGreat Britain, residing at Colliery Road, Wolverhampton, in

thecounty of- Stafford, England, have invented new and useful Improvements in Apparatus for Making Electric-Lamp Bases, 0 which the following is a specification.

This invention relates to improvements in and relating to the manufacture of bases for electric lamps, wherein two or more sepa-- rately made metal portions, which constitute the shell and a terminal or the terminals tive positions, and secured-to each other by of the electric lamp base when manufactured,

are assembled'within a socket in correct rela-v the solidification of a volume of glass-like material which is directed into the socket in a very fluid condition and molded intoclose adherence with the metal shell and terminal or-* terminals; Now in the practiare secured fromdisplacement relatively to eachother independentl of the integral con-- cal carrying out ofthis process it is found that the t1me" occupied in the assembly within the mold of theseparate metal parts is much greater than that requisite for per forming either of the subsequent operations.

Now acccordingto the'present IIIVGIItlOII' the metal shell and the metal. terminal or terminals are formed into to one another by thin ridging strips of metal which,*subsequently to the insertion within the mold of the metal parts in their congregated condition, and prior to the addition of the molten glass, are severed by a cutting operation followed by the bending of the brldging strips, in'an inward direc-' tion relatively to the exterior of the finished base.- The socket, which .receives the shell and terminal or terminals integrally united, is so formed that, after insertion, the parts tive examples, whereb the above described.

improved process can performed.

In these drawings :'Figure 1 is a part sectional elevation ofthe contrivance whereby a pair of terminals. are severed from a shell and temporarily retained in position pend ally, being united drawings two de- 11, mam,-.essr eron 101m rnovling their permanent fixation by" the admismedium. Fig. 1 is an inverted plan of the lower end of the plunger with the assistance of which the severing operation is erformed. Fig. 2 is a planof the socket. ig. 3 is an elevation partly iii-section of a shell for a lamp-base, and'Fig. 4" is an inverted planthereof. Fig. 5.is a lon itudinal section of a-finished lamp-base ta en alon the deviated line 5-5 of Figs-6 and 7, Fig. 6 is aplan, and Fig. 7 is an inverted plan thereof. Fig. 8 is a part sectional elevation showing the molding plunger the section of the socket being at rlght angles to Fig. 1, and Fig. 8"is an inverted plan of the molding plunger. Fig. 9 is asectional elevation of a contrivance for producing a lamp-base of the Edison screw type, Fig. 9 is an inverted plan of theplun'ger, Fig. 10 is a lan of the socket, Fig. 11 is an elevation o the end of the molding plunger, and Fig. 11 is an inverted lan thereof. Fig. 12 is a longitudinal section of a shell for a screw lampbase, and Fig. 13 is an inverted plan thereof.

Fig. 14 is a longitudinal section of a finished screw lamp-base.

' Thechief feature of the invention will be best understood by reference to Figs. 3 and 4 which "exhibit the main element of the base in its initial condition asprovided for the performance of the improved operation, the type ofbase being that in which two separately insulated terminals are employed, and then to Figs. 5-7 which exhibit the finished base. In these figures, a is a thin s1on and consolidation of the insulating metal shell of an electric-lamp-basqthe bottom of which is, by means of dies, formed with two metal terminals 6 b attached to'an inwardly. directed flange a of the shell by narrow metal strips b b each terminal being perforated ,by'a small square hole 6.

Into the shell is fitted a pair of pintles c c which serve as one elementof'the bayonet joint for securing the electric-lamp to the socket of the carrier. This is the article which is fed into a machine .of the t pe described above, whereby will be avoi ed the necessity for se arately assembling the terminals b" b tru y situated relativel to'the pintles c c ofthe shell as hitherto. as been The shell (Figs. 3 and 4),v is

requisite. dropped into the socket d with the pmtles a occupying the slotways d which position pins 6 e of square section carriedum a block 0 will enter the'square orifices in the terminals b b and prevent them from being laterally or angularly displaced after the operation of cutting the. strips 6 b has ries four punches g g the upper ends of which are guided rough orifices'formed in the block e and sever the strips 6 -12 near their attachment to the before mentioned inwardly directed flange a the major portion of the strips being'bent upward as indicated in Fig. 5. Recesses f f are formedin the plunger 'fto receive the extremities of the square pins e and other recesses ---f for the reception of the extremities of the severin punches g -g After the operation 0 cutting and bending u ward the strips '6 the plunger f is wlth rawn, the punches g 1 retire within the block e, with their ends fl ush with the surface of the bottom of the socket, and the socket d, with the shell a and the parted terminals 6 I) held in their proper relative position by the square ins e2 e is displaced to a position in whic a 'definlte volume of melted vitreous material is directed into the shell, where; upon a molding plunger h, Fig. 8, is thrust into the shell on to the surface of the vitreous material causing it to be pressed into intimate contact, on the one hand, with the terminals 6 b and fangs b b thereof and, on the other hand, with the bottom of the shell a the flange a and the parted extremities of the strips b -b .The lower face of the molding plunger 7:. has hollows h it formed therein along a diameter, the direc-' tion of which corresponds to the positions of the pintles a c, permitting an extra quantity' of vitreous material to be solidified at the back of the pintles and strengthen their attachment to the shell. Moreover other re- 5 shell constitutes one of fluid, admitted at h to the upper end 'of the 1 hollow moldin plungerh and conveyed to the lower end, is delivered through a diametral hole It to impinge on the extremities of the pins e e to cool them immediately the plunger h commences to withdraw. After the withdrawal of the molding plunger the socket dis displaced by the angular rotation of the machine and the completed lamp-base finished as shown in Figs. 5-7 is ejected by the upward thrust of a block e which surrounds the block e. operating in a similar manner to produce a lamp-base of the Edisont in which the e electric termifward movement of the For the purpose of nals, the other centrally secured in an insulated manner relatively thereto, a contrivance of simpler. construction will serve the required purpose as will be explained with reference to Figs. 9-14.

Figs. 12 and 13 show the shell on which the operations have to be performed, in

which the central terminal is formed 'integrally with the shell m and connected thereto by strips 70 The shell is formed with an 1m ressed screw thread of coarse pitch where y the lamp-base is secured to the lam carrier.

Referring to igs. 9 and 10, the shellm is dropped into the loosefitting socket n in any angular position, being centered therein by a pin 0 secured to the block 6 above which 1s a portion of the block e which czgrries a cutting-ring p. After the insertion of the shell within the socket, a two-part plunger descends into the shell, the lower edge of the sleeve q of which lunger secures the inward turned lower ange m, of the shell between itself and the upper outer border of the block e, the central portion r'of the plunger descending farther and forcing the terminal 7: downward while the cutting ring p is at the same time forced upward and cuts the strips k In adjacent to the flange m of the shell. The upward movement of the cutting ring and the downortion 1' of the plunger has the effect 0 bendin upward the outer portion of the circular order of the terminal is and the severed strips k k by which it was originally attached to the shell. as shown in Figs. 9 and 14. The plunger g r is then withdrawn and the cutting rin retires into the position shown in Fig. 9 w ereon the socket n with the shell m is translated to a position to receive the vitreous material and.then to a position to re-' ceive the molding plunger 8. By means of this molding lunger the vitreous material is consolidated into close contact with the bottom border of the shell m and terminal is, the cooling fluid being directed toward the pin 0 along the ooves 8 immediately the withdrawal of t e molding plunger commences.

I claim:

1. In an a paratus for manufacturing electric .lampases, means for severing a terminal from the shell of a lamp-base with which said terminal is integrally connected and means for holding said terminal in proper position relatively to said shell preparatory to their permanent reconnection by insulating material.

2. In an apparatus for manufacturing electric lamp-bases, means for severing the terminals from the shell of a lam -base with which said terminals are inte a y connected and means for holding said terminals in proper position relatively to said shell preparatory to their permanent reconnection by 111 said socket engaging a hole in said tersulating material.

minal, a cutter vertically displaceable between said terminal and said shell in said socket, means for molding insulating material in said shell, and means for ejecting said shell and terminal subsequent to their connection by saidinsulatin material.

4. In an apparatus or manufacturing electric lamp-bases, a socket for the reception of a lamp-base shell with integrally connec ed terminals, said socket havm notches for the reception of pintles protruding from said shell, a plunger downwardly displaceable into saidshell and socket, non-circular.

pins in said socket engaging holes in said terminals, cutters vertically displaceable between saidterminals and said shell in said socket, means for molding insulating material in said shell, and means for ejecting said shell and terminals from said socket subsequent to their connection by said in- 5. In an apparatus for manufacturing electric lamp-bases, a socket for the reception of a lamp-base shell with an integrally connected terminal, a plunger downwardly displaceable into said shell and socket, a pin in said socket engaging a hole in said terminal, a cutter vertically displaceable between said terminal and said shell in said socket and a block forming the base of and vertically displaceable in said socket.

6. In an apparatus for manufacturing electric lamp-bases, a socket for the reception of a lamp-base-shell with integrally connected terminals, said socket having notches for the reception of pintles protrudin from said shell, a plunger downwardly isplaceable into said shell and socket, non-circular pins in said socket en aging holes in said terminals, cutters vertically displaceable between said terminals and said shell in said socket and a block forming the base of and vertically displaceable in said socket.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. JOHN EDWARD CRIGGAL.

Witnesses: v

ERNEST BEVANB, BERNARD LEWIS. 

